Volker, > after our latest kernel-update from 4.6. to 4.14.14 we are having > trouble getting data out of our LSI-raid-controllers using the > megacli-binary. > > For every execution of the megacli-binary a line shows up in the kern.log > > ### > [547216.425556] megaraid_sas 0000:03:00.0: Failed to alloc kernel SGL buffer for IOCTL > ### Well, that explains why things aren't working. The kernel is unable to allocate a DMA buffer for the ioctl. There really hasn't been any changes to this code since 4.6. The only thing that springs to mind is some mucking around with the DMA mask in a previous megaraid update. But given how old your controller is, I'd expect this mask to be 32 bits both before and after. Kashyap? Sumit? -- Martin K. Petersen Oracle Linux Engineering
